Book-binder s press-board



(No Model.)

J. H. SHAW.

'BOOK BINDERS PRESS BOARD.

N. PETERS Phuwuuogmphsr. wnihmglun. D. C.

nrrnn rares JOHN H. SHAV, OF CHICAGO, ILLINOIS.

BOOK-BlNDERS PRESS-BOARD.

SPECIFICATION forming part Of Letters Patent No. 399,573, dated March12, 1889.

Application filed December 1l, 1888. Serial No. 293,148. (No model.)

To @ZZ whom it may concern.-

Be it known that I, JOHN H. SHAW, a citizen of the United States,residing at Chicago, in the county of (look and State of Illino.s, haveinvented a new and useful Improvenlent in llook-linders Press-Boards, ofwhich the t'ollowing is a specification.

My said invention will be fully described hereinafter with reference toJthe accompanying drawings, in which- Figure l represents a plan of apress-board embracing my improvement in its construction, and Fig. 2 atransverse vertical section of the same so made as to display one of thespring-rods B.

Such lness-boards have usually been made of cherry-wood, because thatkind of wood is hard and is capable ol a high d egree of polish. Anyother suitable material, however, may be used.

The press-board itself is preferably made up of several narrow boards,(l, the joining edges of which are cemented together by means of glue orother suitable cement, so as to form practically a single board of asmooth, even, and level surface. Such boards have been sometimes madewith strips of board inserted into grooves cut into each end of theboard, with the design of l'neventing springing or warping and ofholdingI the ends of all the narrow parts a in the same plane; but evenwith the use of such end strips such boards have been found much liableto split and warp under the heavy pncssurc brought to bear upon them inbook binding, especially when the bed upon which the book-paper isplaced to undergo pressure yields or is uneven, the press-board being ontop of the pile of leaves of paper. Now, in order to avoid these defectsin such boards as have heretofore been in use, and to render themelastic and durable, I bore round holes of suitable caliber into oneside edge of the board A, nearly through its entire breadth, one holenear each end, and insert into them round steel rods l-l, of sufiicientsize to till them, as shown in Fig. il. The rods need not be quiteaslong as the holes, which at the entering ends maybe plugged up to makea neat finish. The steel rods will eflectually prevent the board fromcracking and breaking lengthwise by reason'o'l. any sharp elevations ordepressions in the bed under the pile of paper. Under great pressure, incase of such unevenness existing, the board will yield sufficiently, butnot break, and by reason of the action of the spring-rods it will resumeits proper level as soon as it is allowed to do so without beinginjured, and it will last in perfect condition for a long time thoughinconstant use.

What I claim as my invention, and desire to secure by Letters Patent,is-

As a new article of manufacture, a bookbinder-s press-board, A, providedwith the steel spring-ro ;ls l,adapting said board to yield in a limiteddegree to unequal pressures without breaking, and to resume its properand original form when relieved, substantially as described.

JOHN Il. SHAXV.

Witnesses:

M. L. THAcKABEnni/g G. E. SAssHEIM.

